tgv.cpp: In function 'void dfs(int, int)': tgv.cpp:28: warning: comparison between signed and unsigned integer expressions tgv.cpp:39: warning: comparison between signed and unsigned integer expressions tgv.cpp:48: warning: comparison between signed and unsigned integer expressions tgv.cpp:56: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp:56: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp: In function 'int main()': tgv.cpp:77: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp:77: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp:78: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp:78: warning: extended initializer lists only available with -std=c++0x or -std=gnu++0x tgv.cpp:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tgv.cpp:71: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result tgv.cpp:73: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result tgv.cpp:76: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result